來源：http://www.xeclipse.com/?p=1359

前言

在使用Spring Security的時候，遇到一個比較特殊的情況，需要根據(jù)用戶名、郵箱等多個條件去驗證用戶或者使用第三方的驗證服務(wù)來進行用戶名和密碼的判斷，這樣SS（Spring Security，一下簡稱SS）內(nèi)置的authentication provider和user detail service就不能用了，花了一些時間去尋找其他的辦法。

前置條件

• Spring MVC 結(jié)構(gòu)的Web項目
• Spring Security
• 使用第三方的Service驗證用戶名密碼（并非數(shù)據(jù)庫或者OpenID等SS已經(jīng)支持的服務(wù)）

需求

• 根據(jù)用戶輸入的用戶名和密碼驗證登錄

問題分析

在嘗試了修改Filter、替換SS內(nèi)置的Filter之后，發(fā)現(xiàn)了一個比較簡單的方法，這里簡單的講講思路。

先看看SS驗證用戶名和密碼的過程：

DelegatingFilterProxy（Security filter chain）:

? ConcurrentSessionFilter

? SecurityContextPersistenceFilter

? LogoutFilter

? UsernamePasswordAuthenticationFilter

? RequestCacheAwareFilter

? SecurityContextHolderAwareRequestFilter

? RememberMeAuthenticationFilter

? AnonymousAuthenticationFilter

? SessionManagementFilter

? ExceptionTranslationFilter

? FilterSecurityInterceptor

這些都是內(nèi)置的Filter，請求會從上往下依次過濾。這里由于我們主要關(guān)心用戶名和密碼的驗證，所以就要從UsernamePasswordAuthenticationFilter下手了。（UsernamePasswordAuthenticationFilter需要AuthenticationManager去進行驗證。）

在SS的配置文件里面可以看到，如何給SS傳遞用戶驗證信息數(shù)據(jù)源（設(shè)置AuthenticationManager）：

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<authentication-manager> ????<authentication-provider> ????????<user-service> ????????????<user name="admin" authorities="ROLE_USER" password="admin" /> ????????</user-service> ????</authentication-provider> </authentication-manager>

當然這里是一個最簡單的配置，跟蹤一下代碼就會發(fā)現(xiàn)：

• 內(nèi)置的AuthenticationManager為org.springframework.security.authentication.ProviderManager

• 默認的AuthenticationProvider為org.springframework.security.authentication.dao.DaoAuthenticationProvider

• 再往下看，這個authentication provider使用org.springframework.security.core.userdetails.UserDetailsService去進行驗證
• 到這里用過SS的都清楚了，只需要實現(xiàn)一個UserDetailService，寫寫下面這個方法就OK了：

1	UserDetails loadUserByUsername(String username) throws UsernameNotFoundException;

到這里問題就出來了： 這個方法只有一個參數(shù)，怎么才能傳遞多個參數(shù)呢？

一個可用的解決方案

重新自定義一個authentication provider，替換掉默認的DaoAuthenticationProvider. 先看看XML的配置：

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<authentication-manager alias="authenticationManager"> ????<authentication-provider ref="loginAuthenticationProvider"> ????</authentication-provider> </authentication-manager> <bean id="loginAuthenticationProvider" ????class="com.XXX.examples.security.LoginAuthenticationProvider"> ????<property name="userDetailsService" ref="loginUserDetailService"></property> </bean>

這里我們依然仿照DaoAuthenticationProvider，傳遞一個UserDetailService給它，下面看看其實現(xiàn)：

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public class LoginAuthenticationProvider extends AbstractUserDetailsAuthenticationProvider { ????// ~ Instance fields ????// ================================================================================================ ????private PasswordEncoder passwordEncoder = new PlaintextPasswordEncoder(); ????private SaltSource saltSource; ????private LoginUserDetailsService userDetailsService; ????// ~ Methods ????// ======================================================================================================== ????protected void additionalAuthenticationChecks(UserDetails userDetails, ??????????????????????????????????????????????????UsernamePasswordAuthenticationToken authentication) ????????????throws AuthenticationException ????{ ????????Object salt = null; ????????if (this.saltSource != null) ????????{ ????????????salt = this.saltSource.getSalt(userDetails); ????????} ????????if (authentication.getCredentials() == null) ????????{ ????????????logger.debug("Authentication failed: no credentials provided"); ????????????throw new BadCredentialsException("Bad credentials:" + userDetails); ????????} ????????String presentedPassword = authentication.getCredentials().toString(); ????????if (!passwordEncoder.isPasswordValid(userDetails.getPassword(), presentedPassword, salt)) ????????{ ????????????logger.debug("Authentication failed: password does not match stored value"); ????????????throw new BadCredentialsException("Bad credentials:" + userDetails); ????????} ????} ????protected void doAfterPropertiesSet() throws Exception ????{ ????????Assert.notNull(this.userDetailsService, "A UserDetailsService must be set"); ????} ????protected PasswordEncoder getPasswordEncoder() ????{ ????????return passwordEncoder; ????} ????protected SaltSource getSaltSource() ????{ ????????return saltSource; ????} ????protected LoginUserDetailsService getUserDetailsService() ????{ ????????return userDetailsService; ????} ????protected final UserDetails retrieveUser(String username, UsernamePasswordAuthenticationToken authentication) ????????????throws AuthenticationException ????{ ????????UserDetails loadedUser; ????????try ????????{ ????????????String password = (String) authentication.getCredentials(); ????????????loadedUser = getUserDetailsService().loadUserByUsername(username, password);//區(qū)別在這里 ????????} ????????catch (UsernameNotFoundException notFound) ????????{ ????????????throw notFound; ????????} ????????catch (Exception repositoryProblem) ????????{ ????????????throw new AuthenticationServiceException(repositoryProblem.getMessage(), repositoryProblem); ????????} ????????if (loadedUser == null) ????????{ ????????????throw new AuthenticationServiceException( ?????????????????????????????????????????????????????"UserDetailsService returned null, which is an interface contract violation"); ????????} ????????return loadedUser; ????} ????/** ?????* Sets the PasswordEncoder instance to be used to encode and validate ?????* passwords. If not set, the password will be compared as plain text. ?????* <p> ?????* For systems which are already using salted password which are encoded ?????* with a previous release, the encoder should be of type ?????* {@code org.springframework.security.authentication.encoding.PasswordEncoder} ?????* . Otherwise, the recommended approach is to use ?????* {@code org.springframework.security.crypto.password.PasswordEncoder}. ?????* ?????* @param passwordEncoder ?????*??????????? must be an instance of one of the {@code PasswordEncoder} ?????*??????????? types. ?????*/ ????public void setPasswordEncoder(Object passwordEncoder) ????{ ????????Assert.notNull(passwordEncoder, "passwordEncoder cannot be null"); ????????if (passwordEncoder instanceof PasswordEncoder) ????????{ ????????????this.passwordEncoder = (PasswordEncoder) passwordEncoder; ????????????return; ????????} ????????if (passwordEncoder instanceof org.springframework.security.crypto.password.PasswordEncoder) ????????{ ????????????final org.springframework.security.crypto.password.PasswordEncoder delegate = (org.springframework.security.crypto.password.PasswordEncoder) passwordEncoder; ????????????this.passwordEncoder = new PasswordEncoder() ????????????{ ????????????????private void checkSalt(Object salt) ????????????????{ ????????????????????Assert.isNull(salt, "Salt value must be null when used with crypto module PasswordEncoder"); ????????????????} ????????????????public String encodePassword(String rawPass, Object salt) ????????????????{ ????????????????????checkSalt(salt); ????????????????????return delegate.encode(rawPass); ????????????????} ????????????????public boolean isPasswordValid(String encPass, String rawPass, Object salt) ????????????????{ ????????????????????checkSalt(salt); ????????????????????return delegate.matches(rawPass, encPass); ????????????????} ????????????}; ????????????return; ????????} ????????throw new IllegalArgumentException("passwordEncoder must be a PasswordEncoder instance"); ????} ????/** ?????* The source of salts to use when decoding passwords. <code>null</code> is ?????* a valid value, meaning the <code>DaoAuthenticationProvider</code> will ?????* present <code>null</code> to the relevant <code>PasswordEncoder</code>. ?????* <p> ?????* Instead, it is recommended that you use an encoder which uses a random ?????* salt and combines it with the password field. This is the default ?????* approach taken in the ?????* {@code org.springframework.security.crypto.password} package. ?????* ?????* @param saltSource ?????*??????????? to use when attempting to decode passwords via the ?????*??????????? <code>PasswordEncoder</code> ?????*/ ????public void setSaltSource(SaltSource saltSource) ????{ ????????this.saltSource = saltSource; ????} ????public void setUserDetailsService(LoginUserDetailsService userDetailsService) ????{ ????????this.userDetailsService = userDetailsService; ????} }

代碼跟DaoAuthenticationProvider幾乎一樣，只是我們替換了UserDetailService，使用自定義的一個新的LoginUserDetailService：

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public interface LoginUserDetailsService { ????/** ?????* 功能描述：根據(jù)用戶米密碼驗證用戶信息 ?????* <p> ?????* 前置條件： ?????* <p> ?????* 方法影響： ?????* <p> ?????* Author , 2012-9-26 ?????* ?????* @since server 2.0 ?????* @param username ?????* @param password ?????* @return ?????* @throws UsernameNotFoundException ?????*/ ????UserDetails loadUserByUsername(String username, String password) throws UsernameNotFoundException; }

一個簡單的實現(xiàn)LoginUserDetailsServiceImpl：

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public class LoginUserDetailsServiceImpl implements LoginUserDetailsService { ????private UserAccountService userAccountService; ????/** ?????* ?????*/ ????public LoginUserDetailsServiceImpl() ????{ ????} ????/** ?????* getter method ?????* ?????* @see LoginUserDetailsServiceImpl#userAccountService ?????* @return the userAccountService ?????*/ ????public UserAccountService getUserAccountService() ????{ ????????return userAccountService; ????} ????/** ?????* 功能描述：查找登錄的用戶 ?????* <p> ?????* 前置條件： ?????* <p> ?????* 方法影響： ?????* <p> ?????* Author , 2012-9-26 ?????* ?????* @since server 2.0 ?????* @param username ?????* @return ?????*/ ????public UserDetails loadUserByUsername(String username, String password) throws UsernameNotFoundException ????{ ????????boolean result = userAccountService.validate(username, password); ????????if (!result) ????????{ ????????????return null; ????????} ????????List authorities = new ArrayList(); ????????GrantedAuthorityImpl grantedAuthorityImpl = new GrantedAuthorityImpl(); ????????authorities.add(grantedAuthorityImpl); ????????LoginUserDetailsImpl user = new LoginUserDetailsImpl(username, password, authorities); ????????grantedAuthorityImpl.setDelegate(user); ????} ????/** ?????* setter method ?????* ?????* @see LoginUserDetailsServiceImpl#userAccountService ?????* @param userAccountService ?????*??????????? the userAccountService to set ?????*/ ????public void setUserAccountService(UserAccountService userAccountService) ????{ ????????this.userAccountService = userAccountService; ????} }

其他相關(guān)的代碼： GrantedAuthorityImpl

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public class GrantedAuthorityImpl implements GrantedAuthority { ????/** ?????* ROLE USER 權(quán)限 ?????*/ ????private static final String ROLE_USER = "ROLE_USER"; ????/** ?????* Serial version UID ?????*/ ????private static final long serialVersionUID = 1L; ????private UserDetails delegate; ????public GrantedAuthorityImpl(UserDetails user) ????{ ????????this.delegate = user; ????} ????/** ?????* ?????*/ ????public GrantedAuthorityImpl() ????{ ????} ????public String getAuthority() ????{ ????????return ROLE_USER; ????} ????/** ?????* setter method ?????* ?????* @see GrantedAuthorityImpl#delegate ?????* @param delegate ?????*??????????? the delegate to set ?????*/ ????public void setDelegate(UserDetails delegate) ????{ ????????this.delegate = delegate; ????} ????/** ?????* getter method ?????* ?????* @see GrantedAuthorityImpl#delegate ?????* @return the delegate ?????*/ ????public UserDetails getDelegate() ????{ ????????return delegate; ????} }

LoginUserDetailsImpl

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public class LoginUserDetailsImpl extends User implements UserDetails { ????/** ?????* ?????*/ ????private static final long serialVersionUID = -5424897749887458053L; ????/** ?????* 郵箱 ?????*/ ????private String mail; ????/** ?????* @param username ?????* @param password ?????* @param enabled ?????* @param accountNonExpired ?????* @param credentialsNonExpired ?????* @param accountNonLocked ?????* @param authorities ?????*/ ????public LoginUserDetailsImpl(String username, String password, boolean enabled, boolean accountNonExpired, ????????????????????????????????boolean credentialsNonExpired, boolean accountNonLocked, ????????????????????????????????Collection<? extends GrantedAuthority> authorities) ????{ ????????super(username, password, enabled, accountNonExpired, credentialsNonExpired, accountNonLocked, authorities); ????} ????/** ?????* @param username ?????* @param password ?????* @param authorities ?????*/ ????public LoginUserDetailsImpl(String username, String password, Collection<? extends GrantedAuthority> authorities) ????{ ????????super(username, password, authorities); ????} ????/** ?????* @param username ?????* @param password ?????* @param authorities ?????*/ ????public LoginUserDetailsImpl(String username, String password) ????{ ????????super(username, password, new ArrayList<GrantedAuthority>()); ????} ????/** ?????* getter method ?????* @see LoginUserDetailsImpl#mail ?????* @return the mail ?????*/ ????public String getMail() ????{ ????????return mail; ????} ????/** ?????* setter method ?????* @see LoginUserDetailsImpl#mail ?????* @param mail the mail to set ?????*/ ????public void setMail(String mail) ????{ ????????this.mail = mail; ????} ????@Override ????public String toString() ????{ ????????return super.toString() + "; Mail: " + mail; ????} }

至于

1 2	<bean id="userAccountService" ????????class="com.XXX.UserAccountService"/>

它的實現(xiàn)就隨你的意吧，這里是模仿第三方的一個實現(xiàn)。

小結(jié)

為了自定義一個authenticationProvider，我們還需要自定義一個UserDetailsService，只需要這2個類，就實現(xiàn)了對驗證參數(shù)的擴展了。。。

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